I have created a building in SketchUp6 (free version), having worked on it for several weeks. Just recently I have been unable to load the file. I am informed by the system that it is not a sketchup file. The file now has a .skb extension. I have changed the extension to .skp to see if that would allow it to load - it didn't. My system has not crashed or undergone any changes.
I have attempted, with no success, to find a solution on the internet. There was a site that advertised the repair of a wide variety of files, sketchup included. When contacting the site I was informed that they are not equipped to repair .skp files "at this time".
As a freshman to this forum I would appreciate any direction anyone could give me.

P: Sandy